Detection of Lightning Return Strokes Hitting Wind Turbines in Winter by JLDN

Abstract

In winter of 2010 and 2011, 65 return stroke currents were observed by Rogowski coils at 14 wind turbines in the coastal area of the Sea of Japan. Performance of JLDN, a large-scale lightning location system (LLS), in lightning detection is evaluated by comparison with the ground-truth data. Detection efficiency of JLDN highly depended on the peak current of return strokes, and strokes more than 15kA in their peak values were all detected by JLDN irrespective of the polarity of the current. Absolute values of the peak current estimated by JLDN were on the average about 20% smaller than the directly measured values.